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Websites setting Frame-Options HTTP header

Values

Most popular variants of the header value (we only show this when there's just a bunch of variants):

A misspelled and incorrect variant of the X-Frame-Options header introduced as a result of incorrect interpretation of RFC 7034 standard. The Frame-Options variant was introduced to be used in Content Security Policy (CSP) while for HTTP headers the X-Frame-Options remains the valid name.

Reference...

We have seen 6 websites setting the Frame-Options HTTP header and 3 unique values of this header.